From: Colton Lewis <coltonlewis@google.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Colton Lewis <coltonlewis@google.com>,
qemu-arm@nongnu.org, qemu-devel@nongnu.org,
kvmarm@lists.linux.dev, Paolo Bonzini <pbonzini@redhat.com>,
Marc Zyngier <maz@kernel.org>, Oliver Upton <oupton@kernel.org>,
Will Deacon <will@kernel.org>,
James Clark <james.clark@linaro.org>,
Mingwei Zhang <mizhang@google.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH] target/arm: Enable KVM PMU partitioning and counter limit
Date: Thu, 1 Oct 2026 21:34:09 +0000 [thread overview]
Message-ID: <20261001213409.2090008-1-coltonlewis@google.com> (raw)
In-Reply-To: <CAFEAcA9DYo3GW_59eZjsk1qL0--3amYd7ufPqt80O2qv=Qm_pw@mail.gmail.com>
Hi Peter,
On Wed, Sep 30, 2026 at 12:35:02PM +0100, Peter Maydell wrote:
> On Tue, 29 Sept 2026 at 22:21, Colton Lewis <coltonlewis@google.com> wrote:
> > For the counter limit property, would you prefer that it also live in
> > kvm_arm_add_vcpu_properties() as "kvm-pmu-num-counters" (KVM-only), or
> > keep "pmu-num-counters" general so TCG can also use it to override
> > PMCR_EL0.N in reset_pmcr_el0?
>
> If it can reasonably easily be implemented (or potentially implemented)
> for TCG, then I guess the general name makes most sense.
Sounds good. I will keep "pmu-num-counters" general (and wire it up to
override PMCR_EL0.N for TCG as well) and move the partitioning toggle
into kvm_arm_add_vcpu_properties() as "kvm-pmu-partition" in RFC v2.
Thanks,
Colton
next prev parent reply other threads:[~2026-10-01 21:34 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 17:29 [PATCH v9 00/22] ARM64 PMU Partitioning Colton Lewis
2026-09-24 17:29 ` [PATCH v9 01/22] arm64: cpufeature: Add cpucap for HPMN0 Colton Lewis
2026-09-24 17:45 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 02/22] KVM: arm64: Reorganize PMU includes Colton Lewis
2026-09-24 17:38 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 03/22] KVM: arm64: Reorganize PMU functions Colton Lewis
2026-09-24 17:49 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 04/22] perf: arm_pmuv3: Generalize counter bitmasks Colton Lewis
2026-09-24 17:37 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 05/22] perf: arm_pmuv3: Move counter allocation mask to per-CPU struct pmu_hw_events Colton Lewis
2026-09-24 17:44 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 06/22] perf: arm_pmuv3: Check cntr_mask before using pmccntr Colton Lewis
2026-09-24 17:38 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 07/22] perf: arm_pmuv3: Allocate counter indices from high to low Colton Lewis
2026-09-24 17:37 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 08/22] KVM: arm64: Add initial scaffolding for Partitioned PMU Colton Lewis
2026-09-24 17:44 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 09/22] KVM: arm64: Set up FGT " Colton Lewis
2026-09-24 17:52 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 10/22] KVM: arm64: Add Partitioned PMU register trap handlers Colton Lewis
2026-09-24 17:50 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 11/22] KVM: arm64: Set up MDCR_EL2 to handle a Partitioned PMU Colton Lewis
2026-09-24 17:53 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 12/22] KVM: arm64: Context swap Partitioned PMU guest registers Colton Lewis
2026-09-24 17:55 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 13/22] KVM: arm64: Enforce PMU event filter at vcpu_load() Colton Lewis
2026-09-24 17:47 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 14/22] perf: Add perf_pmu_resched_update() Colton Lewis
2026-09-24 17:46 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 15/22] KVM: arm64: Allow kvm_vcpu_pmu_resync_el0() to resync filters in process context Colton Lewis
2026-09-24 17:51 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 16/22] KVM: arm64: Apply dynamic guest counter reservations Colton Lewis
2026-09-24 17:57 ` sashiko-bot
2026-09-30 15:28 ` James Clark
2026-10-01 21:33 ` Colton Lewis
2026-09-24 17:29 ` [PATCH v9 17/22] KVM: arm64: Implement lazy PMU context swaps Colton Lewis
2026-09-24 17:55 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 18/22] perf: arm_pmuv3: Handle IRQs for Partitioned PMU guest counters Colton Lewis
2026-09-24 18:03 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 19/22] KVM: arm64: Detect overflows for the Partitioned PMU Colton Lewis
2026-09-24 18:07 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 20/22] KVM: arm64: Add vCPU device attr to partition the PMU Colton Lewis
2026-09-24 17:56 ` sashiko-bot
2026-09-30 15:27 ` James Clark
2026-10-01 21:21 ` Colton Lewis
2026-09-24 17:29 ` [PATCH v9 21/22] KVM: selftests: Add find_bit to KVM library Colton Lewis
2026-09-24 17:52 ` sashiko-bot
2026-09-24 17:29 ` [PATCH v9 22/22] KVM: arm64: selftests: Add test case for Partitioned PMU Colton Lewis
2026-09-24 17:55 ` sashiko-bot
2026-09-24 17:30 ` [PATCH] target/arm: Enable KVM PMU partitioning and counter limit Colton Lewis
2026-09-28 14:01 ` Peter Maydell
2026-09-29 21:21 ` Colton Lewis
2026-09-30 11:35 ` Peter Maydell
2026-10-01 21:34 ` Colton Lewis [this message]
2026-09-30 15:25 ` [PATCH v9 00/22] ARM64 PMU Partitioning James Clark
2026-10-01 21:33 ` Colton Lewis
2026-09-30 15:26 ` James Clark
2026-10-01 21:33 ` Colton Lewis
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